Waterborne epoxy curing agent

The aqueous epoxy resin may be formed by different forms of water-based water-dispersible form of three ways: ① water soluble; ② micelle-dispersed; ③ emulsion. Epoxy resins are thermoplastic linear structure itself, after heating the solid to liquid, high viscosity to a low viscosity, only be used in conjunction with a curing agent that has the practical value (the pure one-component waterborne epoxy systems also need to add a latent hardener). Therefore waterborne epoxy system should contain waterborne epoxy resin and waterborne epoxy curing agent, the same, they are different ways of forming three kinds of water-based water-dispersible form. Therefore waterborne epoxy systems have more choices combination (theoretically form a combination of nine kinds), but also increases the choice difficult. While the actual application process, by adding a large amount of fillers and additives to improve application performance waterborne epoxy systems also cover the shortage of waterborne epoxy systems even serious flaws, which will increase more uncertainty and complexity sex. Of simplifying, were concerned about waterborne epoxy resin form and waterborne epoxy curing agent forms the same time, control and evaluation of the nature of water-based epoxy aqueous epoxy achieve faster, better choice waterborne epoxy system for your towering building lay a solid foundation! ! Waterborne epoxy system is essentially an aqueous epoxy Regardless of the selected form of aqueous epoxy resins and waterborne epoxy curing agent, and ultimately have practical value is a decentralized multi-phase structure, from an aqueous epoxy resin, waterborne epoxy curing agents, water and other multi-phase, whose formation mechanism is different from the polymer emulsions such as an acrylic emulsion of a film (condensation deposition, physical process), while the solvent-epoxy film formation is not exactly the same, in a solvent epoxy systems, epoxy resin and hardener are molecularly dissolved in the organic solvent, homogeneous system is formed, the curing reaction between the molecules, so that the curing reaction is relatively full, the formed cured It was also homogeneous. Polyphase system waterborne epoxy, epoxy resins and curing agents dispersed phase dispersed in the aqueous phase, crosslinking internal diffusion process is the mutual penetration during the crosslinking reaction between particles in the process of evaporation, so the aqueous Epoxy curing degree depends on the following four factors: a) Compatibility: compatibility waterborne epoxy resin and waterborne epoxy curing agent of the better, more conducive to mutual diffusion inside particles and epoxy curing agent particles, curing the reaction in favor; b) particle diameter: when smaller particle size, aqueous epoxy curing agent with the aqueous epoxy resin dispersed phase particles with each other can be more fully penetrate into the core so as to achieve more complete degree of cure; c) a hydrophilic lipophilic balance: waterborne epoxy resin with a hydrophilic-lipophilic balance waterborne epoxy curing agent close to reach consensus in the aqueous phase coexistence steady state, if the difference is large, the hydrophilic component will gradually gathered a strong in the aqueous phase, resulting in the resin phase separation and a curing agent; d) the uniformity of dispersion: In the multi-phase separation state, only through certain mechanical agitation to the resin and the curing agent phase with uniformly distributed in the aqueous phase ; and (epoxy stirred mixed in the application is very important) (some friends in the process that the use of oil-based epoxy or simply stirring without stirring a film can, in fact, there is a big misunderstanding, because the oil used in the ring dissolved oxygen is formed by the solid epoxy such as 75% of E-20, without strengthening agent, after evaporation of the solvent to form a hard dry state, but this is a dry film without curing the crosslinking agent, After heated into a liquid, a dry film is no performance at all).